Micrometer-gage.



O. 0. SGHELLENBAOH.

MIOROMETER GAGE.

APPLICATION FILED SEPT. 8, 1908.

s rairnuir orricn CHARLES O. SCHELLENBACH, OF CINCINNATI, OHIO.

MICROME TEE-GAGE To all whom it'may concern:

Be it known that I, CHARLES O. SCHELLEN- EACH, a citizen of the United States, residing at Cincinnati, Hamilton county, Ohio, have invented certain new and useful Improvements in Micrometer-Gages,of which the following is a specification.

This invention, pertaining to improvements in micrometer gages, will be readily understood from the following description taken in connection with the accompanying drawing in which:

Figure 1 is a perspective view of my imn'oved gage: F ig. 2 a side elevation of the base-clamp: Fig. 3 a vertical longitudinal section of the spindle-stock at the spindleelamp: Fig. 4 a bottom view of the bar: Fig. a vertical longitudinal section of the baseblock: Fig. 6 avertical transverse section of the s indle-stock and bar-clamp; Fig. 7 a side e evation ofthe general instrument when used as a vertical measuring machine to measure between the spindle and the baseanvil: Fig. 8 a side elevation of the general instrument when used as a measuring ma chine to measure between the spindle and a surface against which the base of the instrument sets: Fig. 9 a side elevation of the general instrument when used as a surface and scribing gage: Fig. 10 a side elevation of the instninient'when used for inside gaging: Fig. 11 an elevation, of the inner face of the supplementary spindle-arm: Fig. 12 a plan of the scratch-disk: and Fig. 13 a vertical section of the scratch-disk.

In the drawing :1 indicates a bar of general cylindrical form and having a flattened side: 2, an -anvil-stock having in its hub a socket fitting accurately upon a tenon on one end of the bar: 3, a screw in the tenon end of the bar and serving to hold the anvilstock firmly to place: 4, the shoulder on the bar, at the foot of the tenon, against which the anvil-stock is accurately drawn by screw 3: 5, the anvil at the inner face of the outer extremity of the anvil-stock, this anvil forming one of the measuring surfaces when the instrument is in use with the anvil-stock: 6, the spindle-stock, arranged to slide on the bar to and from. the anvil-stock: 7, the spindle, sliding through the outer extremity of the spindle-stock, parallel with the bar and in alinement with the anvil, as usual in micrometer gags,.the inner end of this spindleforming-one of the measuring surfaces of the Instrument: 8. micrometer mechamsm co- Specification of Letters Patent. Application filed September 8, 1908.

spindle-stock to Patented June 1, 1909. Serial No. 451,929.

and, preferably, reading to the thousandth of an inch: 9, a split bushing surrounding the spindle and nicely fitting the spindle, this bushing having a tapering exterior fitting a tapering bore in the inner portion of the spindle-bearing in the spindle-stock: 10, a nut seated in a transverse slot in the spindlebearing and engaging a threaded hub projecting from the rear of the tapered bushing: 11, a clamp-nut to serve in clamping the selected position on the bar: 12, the flattened side of the bar, extending the entire length of the bar over which the spindle-stock is to slide: 13, a longitudinal series of tapering or conical holes in the flat side of the bar, the distance between these holes being accurately established to some standard unit, preferably one inch: 14, the hub of the spindle-stock, accurately fitting the unflattened portion of the bar: 15, a plate secured against the open side of this hub andlying against the flattened face of the bar but not with any such tightness as to interfere with the free sliding of the hub upon the bar, this plate forming a separable portion of the wall of the hub: 16, a hollow threaded nose projecting outwardly from this plate, the clamp-' mg nut 11 screwing upon this nose: and 17,

a dowel-pin accurately fitting the bore of the nose and sliding therein and having its inner end formed to fit the index holes 13 in the bar, the outer end -'of this pin being connected with clamping nut 11 so that the nut may move the pin in or out of engagement with the bar.

The instrument as thus far described is to be considered as a micrometer gage to be held in the hand and employed inthe manner usual with micrometer gages. Assume the range of endwise movement of he spindle to be one inch, reading in-thousandths on the micrometer as usual, and assume the spindlestock to be positioned on the bar with its dowel-pin in the second hole of -the bar. Under these conditions, when the micrometer stands at zeros, the spindle will be in po-, sition of maximum retreat, and the distance between the anvil and the spindle-end will be one inch. The micrometer may then be used for gaging any dimensions-u inch. If, now, the spindle-stock e positioned onthe bar with itsdowel-pinin'the to one third hole of the bar then one inch has been added to the measuring capacity of the inl to any material extent.

The cross-sectional form of the bar, a tylinder with a flat side,

strument and dimensions between one and 1 two inches maybe read lrom the the. nncromete-r, and so on, up to the length capacity of g the bar as determined by the dowel hole l'ar- 5 thest from the anvilstocl the number of dowel holes in the series indicating all but the final inch, the final inch, or as much as there is of it, being read from the micrometer.

So far as mere measuring capacity 15 concerned, that of the instrument, as thus far i described, does not exceed that of known lnut, a construe micrometer gages with shifting spindleing at them.

In using eral character, it is often desirable to lock stocks, but in the present instrument the construction 18 such as to enhance the aet-uracy of the results and the facility for arrivspindle after adjustment and locks have been 1 provided for this purpose.

case, under ordinary'ronditions this spindle i is free to slide freely through bushing 9,

fitting it nicely and being supported by it at a point as close as possible to the end of the spindle. "When it is desired to lock the spindle then nut 10 is-turned, drawing the split bushing inwardly and contracting it u on the s indie which becomes tightly c amped wit out disturbing its axial posi- 22, a

micromeparallel with and near the bore of the hub,

tion. Known spindle-clamps in ters are defective in that they are defective in clamping power, or throw the spindle to eccentric position, or interfere or do not promote the guidance of the spindle at a point as near as possible to its gaging end. In the resent case the split bushing, quite apart from its capacity as a spindleock, serves as an adjustable nicely fitting guide at the extreme inner portion of the spindle-bearing in the spindle-stock.

In setting the spindle-stock to selective position upon the rod, eyesight need not be depended upon further than to determine, by means of designating numbers on the rod, the number of. the dowel-hole which is to be employed. The dowel-pin having been brought into fair coincidence with the selected hole, when clamping nut 11 is screwed up it forces the end of the dowel-pin into the dowelhole and by that act shifts the spindle-stock along the rod to accurate position and clamps it'there, the same in thus accurately positioning the spindlestock serving also to grip the spindle-stock firmly and accurately to the inside or unflattened side of the bar. 1 When the dowelpin is withdrawn from the 'bar, to permit the spindle stock to be shifted, then the flat side of the bore of the hub, as represented b the inner surface of plate 15, cooperates wit the flat side of the bar and prevents the spin- 65 die-stock from shifting angularly on the bar In the present finger-motion which serves lends itself to accurate and economh al produition, as is also the vase with the noncylindriral bore of the hub ofthe spindlestml; when formed partly by the attarhcd plate 15. It should be stated that clampnut 1 1 is swiveled upon thehead of the dowelpin so that the latter need not turn with the tion deemed preferable to screwing the pin through nose 16, the latter construction being, however, in other respects equivalent to that illustrated.

The instrument has been thus far described as a convenient gage ofconsiderable range, to be held in thehand and used in measuring gaging. I also arran e for the use of the instrument for internal gaging.

Proceeding with the drawing 18 (Figs. 10 and 11) indicates a short arm having its hub clamped removably upon the extreme end of the spindle: 19, an outwardly facing gage-surface on the outer face of, the outer extremity of this arm: 20, a substitute anvilstock to take the lace of regular anvil-stock 2 on the end of t 1e bar: 21, an anvil on the outer surface of the outer extremity of the I stock 20 and arm 18 l measuring surfaces 21 and substitute anvil-stock, the lengths of anvilbeing such that the 19 carried by them will be the same distance from the bar: and screw threaded into the hub of arm 18 this screw having a flat head projecting inwardly beyond the wall of the bore.

When substitute anvil-stock 20 is in place then the instrument presents a measuring anvil outwardly instead of inwardly, and when arm 18 is in place then measuring surface 19 becomes an outwardly presenting surface as a substitute for the inwardly presenting measuring surface represented by the end of the spindle. Screw 22 is screwed tightly up against the end of the arm 18 and its inner surface comes in contact with the measuring end of the spindle, the consequence being that, when the arm is secured to the spindle, with the head of the screw against the end of the spindle, measuring surface 19 stands rearward a definite dis tance from the end of the spindle. Let this distance he, say, one quarter of an inch. Having reference to the plane'of the surface of regular anvil 5 when the regular anvil stock is employed, let the surface ofsubstitute anvil 21 be, say, three-quarters of an inch outwardly from that plane, a matter to be determined, in making the instrument, by thedistance from shoulder 4 to anvil 21, as compared with the distance from shoulder 4 to anvil 5. Under these conditions the instrument may be employed for inside gaging and the capacity of the instrument would be one inch more than when the instrument is arranged and employed for outside gaging,

that is to say, the inches as determined by Thus far reference has been made only to the dowel-hole, should be taken as one more, the employment of the instrument as a gage the micrometer being read as usual for any- I measuring between the spindle and an anvil represented by zero, such is not the case for thing within the one inch capacity of the carried by an anvil-stock. Other and quite a spindle movement. While for outside gagi different uses for the instrument are proing the instrument has a minimum capacity I vided for.

l The clamp and anvil-stock bein tempoinside gaging for the instrument will be inrarily abandoned; the tenon end the bar capable of gaging any inside dimension less may b than the outside distance between measurwith th ing surface 19 and 21 when the arm and sub- 5 anvil 25. stitute anvil-stock are in position of nearest supportin approach, the minimum capacity for inside in Fig gaging thus being, under the assumed set of the socket 0 secured in the socket of the block, e micrometer spindle over block- The device then becomes a self g measuring machine as; illustrated y giving the bar a half turn in f the block the parts take the dimensions for the instrument, somethim osition indicated in Fi 8, the instrument e P g less than one inch.

been considered as-an instrument to be held I 1 now becoming As thus far described the instrument, l the end of the s a micrometer surface gage, whether for inside or outside gaging, has l termining dista pindle being employed in nces from it to any flat surface on which the block may stand. As the in. the hand of the user. I make provision l thickness of the for the use of the instrument, either for into the top of its block, from its'lower surface anvil 2.5, is one unit, or one side or outside gaging, as a "self-supporting inch, it follows that one inch is to be added structure after the manner of a measuring to the reading machine.

s of the instrument. By

placing arm 18 on the spindle when the 25 Continuingwith the drawing-23 indiinstrument is otherwise in the condition cates a flat block of suflicient weight to form illustrated in Fig. 8, the device serves as a a substantial base for the. instrument, but surface gage for measuring the dlstance be light enough to permit of ready handling, tween a downw the side edges of the block being grooved to the surface on facilitate grasp "by the fingers, this block this use of the forming also an anvil-carrying member: 24, require to be the accurately finished lower face of the ardly presenting surface and which the block rests, andin instrument the readings will modified by allowing for the distance from the end of the spindle to the lock; 25, a measuring anvil formed by or plane of measuring surface 19.

upon the upper surface of the block, the distance from this anvil to the lower surface of cates a sha the block being a definite unit corres ondclamped to th dbwelface of the di holes in the bar, one inch in the resent inright angles stance: 26, a vertical cylindrica socket in the 40 the block, of a diameter ada ting it to acnotc curatelv fit the tenon end of t e bar, the disthe disk, tance rom this socket to anvil 25 correspindlei s onding with the distance from the bar to scribed 'i tli having a shank the disk ing with the distance between the e spindle: 27. a clamp the lower adapted to fit the socket in the block and the instrument appears as in Fig. 9. The having a fork adapted to grasp the bar and edge of the disk is very'lsharp and serves as a support it in horizontal position: and 28, a scriber, the instrument thus becoming a screw for tightening the clam upon the bar micrometer scribing age. Screw 3,0 accuto hold the bar tightly or, i desired, with rately positions the at face of the scribing just sufficient looseness to permit the bar to disk into the plane of the end of the spindle be turned in the clamp.

and, the face of the disk being flat, no subse- When the instrument is supported in the quent grinding of the top of the disk or in the clamp, as seen in Fig. 1, then the gage can faces of the notches to be used as a fixture after the manner of a ments sharp, measuring machine, though of such ortable instrument a eep'its scribing elegage. When the character as to be readily'placed w are deinstrument hasbeen afjusted' for scribing sired. The gage can be rotated upon the then the spindle is to be clamped before the vertical axis of the clamp and it can also be scribing disk does its Work, otherwise, the

turned upon the horizontal axis of the bar, work of scri thus permitting the gage to be shifted to spindle and avorable to the res'entation justment.

positions most of work and most favorable to t e illumination and reading of the micrometer, a very micrometer class.

hing would tend to turn the disturb the micrometer addecided. advantage in instruments of the orally cylindrical slnface and provided with a longitudinal series ofeonic dowel-holes,

1. A gage comprising, a bar having a gen- I a spindle-stock having a hub adapted to fit and hug the cylindrical surface of the bar opposite the surface provided with the series of dowel-holes and carrying a 5 to register with any selected one of said dowel-holes, a dowel-pin fitting saidsocket and having a conical end adapted to said dowel-holes, and a screw device for moving the dowel-pin into and out of the dowelholes, combined substantially as set forth 2. A gagacomprising, a bar having a cylindrical surface and a flat face and provided with a longitudinal series of conical dowel-holes in said flat face, a spindle-stock having a hub adapted to fit and hug the cylindrical surface of the bar and carrying a socket ada ted to register with any selected one of sait dowel-holes, a dowel-pin fitting said socket and having a conical end adapted to said dowel-holes, and a screw device for moving the dowel-pin into and out of the dowel-holes, combined substantially as set forth.

3. A. gage comprising, a bar having a cylindrical surface and a fiat face and provided with a longitudinal series of conical dowel-holes in said fiat face, a spindle-stock having a hub adapted to fit and hug the cylindrical surface of the bar and carrying a socket adapted to register with any selected one of said dowel-holes, a dowel-pin fitting said socket and having a conical end adapted to said dowel-holes, a screw-thread on the exterior of the wall of said socket and concentric therewith, said screw-thread and end of the dowel-pin, tially as set forth.

4. Agage comprising, a bar having a cylindrical surface and a fiat face and provided with a longitudinal series of conical dowel-holes in said flat face, a spindle-stock having a hub adapted to fit and hug the cylindrical surface of the bar and having an 45 open side at the flat face of the bar, a plate secured to the open side of said hub and having an outwardly projecting exteriorly threaded nose provided with a cylindrical socket, a dowel-pin fitting said socket and having a conical end adapted tosaid dowelholes, and a nut swiveled to the outer end of the dowel-pin and engaging the thread of the nose, combined substantially as set forth.

5. A gage comprising, a bar novided at one end with a tenon and shoukfer and having a generally cylindrical surface and provided with a longitudinal series of conical dowel-holes, a s indle-stock having a hub ada ted to fit an of t e bar opposite the surface provided with the series of dowel-holes and carrying a socket ada ted to register with any selected one of sai dowel-holes, a dowel-pin fitting said socket and having a conical end adapted 65 to said dowel-holes, a screw device for movswiveled on the outer combined substair and a nut engaging hug the cylindrical surface socket adapted pressing having a conica ing the dowelin into and out of the dowelholes, an anvi stock engaging the tenon of the bar, and a screw at the end of the bar for the anvilstock to said shoulder, combined substantially as set forth.

6. A gage comprising, a bar having a generally cylindrical surface and provided with a longitudinal series of conical dowel-holes, a spindle-stock having a hub adapted to fit and hug the cylindrical surface of the bar opposite the surface provided with the series of dowel-holes and carrying a socket adapted to register with any selected one of said dowelholes, a dowel-pin fitting said socket and having a conical end adapted to said dowelholes, a screw-device for moving the dowelpin into and out of the dowel-holes, a block, and a clamp carried by the block and ada )ted to engage said bar, combined substantially as set forth. a

7. A gage comprising, a bar having a generally cylindrical surface and provided with a longitudinal series of conical dowel-holes, a spindle-stock having a hub adapted to fit and hug the cylindrical surface of the bar opposite the surface provided with the series of dowel-holes and carrying a socket adapted to register with any selected one of said dowel holes, a dowelin fitting said socket and end adapted to said dowellroles, a screw-device for moving the dowelpin into and out of the dowel-holes, a' block, and a clam carried by the block and adapted to rotataby and slidably engage said bar, combined substantially as set forth.

8. A gage comprising, a bar having a generally cylindrical surface and rovided with a longitudinal series of conical dowel-holes, a spindle-stock having a hub adapted to fit and hug the cylindrical surface of the bar oppo- 105 site the surface provided with the series of dowel-holes and carrying a socket adapted to register with any selected one of said dowelholes, a dowelin fitting said socket and having a conica end adapted tosaid dowel- 110 holes, a screw device for moving the dowelpin into and out of the dowel-holes, a block provided witha vertical cylindrical socket, and a clamp mounted for angular motion in said socket and ada ted to grasp said bar, 115 combined substantially as set forth.

9. A gage comprising, a bar provided at one end with a tenon and shoulder and having a generally cylindrical surface and provided with a longitudinal series of conical 120 dowel-holes, a spindle-stock havin a hub ada ted to fit and hug the cylindrica surface of t 1e bar opposite the surface provided with the series of dowel-holes and carrying a socket ada ted to re ister with any selected 125 one of sai dowel-ho es, a dowel-pin fitting said socket and having a conical end adapted to said dowel-holes, a screw device for movin the dowel-pin into and out of the dowelho es, an anvil-stock removably engaging 130 and to grasp said bar, 5i;tially as set forth.

one end with a tenon and shoulder and havmg a generally (7Vl111(ll'10i1l surface and pro- 10 dowel-holes, a spindle-stock havin socket adapted to register with any selected l 15 one of said d iwel-l1oles, a dowel-pin fitting i said tenon, a block provided with a vertical cylindrical socketmlapted to fit said tenon,

and a clamp adapted to engage said socket i ing thedowel-pin into and out of the d0welcombined substanholes, an anvil-stock removabl engaging i said tenon, a block dprovided Wit 1 cylindrical socket a apted to fit said tenon, a i clamp adapted to engage said socket and to grasp said bar, and an anvil carried by the vided with a longitudinal series of conical up er face of the block, combined substand l p 1 1 l i a hub 5 tiaily as set forth. a a)te( to fit and mgt 1e 0 indricz surface 1 y r of the bar opposite the surfa ce provided with j CHARLES SCHELLENBACH' the series of dowel-holes and carrying a f Witnesses:

W. J. DAVIDSON,

O. SHiNDELDEoKER.

said socket and having a conical end adapted to said dowel-holes, a

screw device for mov- 10. A gage comprising, a bar provided at a vertical 

